Russian police gave detained more than 30 people, most of them women, who were staging separate one-person protests in support of an LGBT+ artist who is charged with spreading pornography through her art.
The arrest happened mainly in Moscow with at least one person being detained in St Petersburg
This comes , according to OVD-Info, which monitors law enforcement issues in Russia.
Earlier this month, Russian police charged Julia Tsvetkova, an LGBT and feminist activist, with spreading pornography via her pictures, she said on her Facebook page.
If found guilty, Tsvetkova may face up to six years in prison.
One of those detained in Moscow held a placard saying: “Today they send to prison for pictures, tomorrow they will send to prison for letters? Freedom for Julia Tsvetkova!”
One-person protests are usually legal in Russia. However, there have been numerous cases of demonstrators being detained.
Police declined to comment on the detentions on Saturday.
Western governments and human rights activists have criticised the Russian authorities for their treatment of LGBT people.
A vote on proposed changes to the Russian constitution is ongoing. Among many amendments put forward by president Vladimir Putin is an article defining marriage as a union between a man and a woman.